Quick Answer
The answer is the Custom Indicators (IOCs) feature in Microsoft Defender for Endpoint. This is correct because it enables security teams to manually ingest and manage threat intelligence from external sources, such as IP addresses, URLs, domains, or file hashes, allowing MDE to create alerts or block actions based on those custom indicators of compromise. On the Microsoft Cybersecurity Architect exam, this question tests your understanding of how to extend MDE’s detection capabilities beyond built-in feeds, often appearing as a scenario where you must choose between automation rules, threat intelligence APIs, or custom IOCs. A common trap is confusing custom indicators with automated threat intelligence connectors—remember that custom IOCs are for manual, targeted ingestion, not bulk automated feeds. Memory tip: think “Custom IOCs = manual control for specific threats.”
This SC-100 practice question tests your understanding of design solutions that align with security best practices and priorities. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Your company uses Microsoft Defender for Endpoint (MDE) and wants to integrate threat intelligence from an external source to improve detection. The security team needs to ingest custom indicators of compromise (IOCs) into MDE. Which feature should they use?
Advanced Hunting
Why wrong: Advanced Hunting queries data, not imports IOCs.
Threat Analytics
Why wrong: Threat Analytics provides reports, not IOC ingestion.
Automated investigation and response
Why wrong: AIR is for automated response, not IOC ingestion.
Custom indicators (IOCs)
Custom indicators allow ingestion of IOCs from external sources.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Custom indicators (IOCs)
Option D is correct because the Custom Indicators (IOCs) feature in Microsoft Defender for Endpoint allows security teams to manually ingest and manage threat intelligence from external sources, such as IP addresses, URLs, domains, or file hashes. These indicators are then used by MDE to create or block alerts, enabling tailored detection beyond built-in threat intelligence feeds.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Advanced Hunting
Why it's wrong here
Advanced Hunting queries data, not imports IOCs.
Threat Analytics
Why it's wrong here
Threat Analytics provides reports, not IOC ingestion.
Automated investigation and response
Why it's wrong here
AIR is for automated response, not IOC ingestion.
Custom indicators (IOCs)
Why this is correct
Custom indicators allow ingestion of IOCs from external sources.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse 'Advanced Hunting' (a query tool) with a feature for importing threat data, or they mistakenly think 'Threat Analytics' allows custom feed integration, when in fact it only displays Microsoft's pre-built analysis.
Detailed technical explanation
Under the hood, custom IOCs in MDE are stored in the cloud and evaluated against real-time telemetry via the Defender for Endpoint detection engine, using a priority-based matching system (e.g., exact match for file hashes, CIDR matching for IPs). A subtle behavior is that IOCs can be set to 'Alert and Block' or 'Alert Only' modes, and they support expiration dates to manage temporary threat feeds. In a real-world scenario, a SOC might ingest a feed of malicious IPs from a third-party threat intelligence platform using the Microsoft 365 Defender API to automate IOC updates.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
Design solutions that align with security best practices and priorities — This question tests Design solutions that align with security best practices and priorities — Read the scenario before looking for a memorised answer..
The correct answer is: Custom indicators (IOCs) — Option D is correct because the Custom Indicators (IOCs) feature in Microsoft Defender for Endpoint allows security teams to manually ingest and manage threat intelligence from external sources, such as IP addresses, URLs, domains, or file hashes. These indicators are then used by MDE to create or block alerts, enabling tailored detection beyond built-in threat intelligence feeds.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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